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Note 13 - Notes Payable (Details Textual)
$ in Thousands
Jul. 19, 2019
USD ($)
MonthlyPayments
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 29, 2022
USD ($)
Debt Instrument [Line Items]        
Notes payable, current   $ 50 $ 49  
Promissory Note [Member]        
Debt Instrument [Line Items]        
Notes payable, current   $ 50 $ 49  
Viewpoint Molecular Targeting, Inc. [Member] | Promissory Note [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 100      
Debt instrument, interest rate 3.00%      
Debt instrument, number of monthly payments | MonthlyPayments 36      
Amount raised through selling of equity $ 1,000      
Viewpoint Molecular Targeting, Inc. [Member] | Promissory Note for Purchasing Land and Building [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount       $ 1,700
Debt instrument, interest rate       6.15%
Debt instrument balloon payment       $ 1,500